Since childhood I have been told that our American attention span has been shrinking rapidly because we spend so much time reading novels, talking on the phone, going to movies, listening to the radio, watching television, snap-chatting on computers and smart phones or walking to the bathroom. As far as I can tell, though, each of us has a long attention span when engaged in something that interests us. Maybe the human attention span is determined by DNA and has not changed much in the last 100,000 years. I see my ancient ancestor emerging from a cave with her eyes darting in six directions, looking for bears and snakes and suddenly remembering that she forgot to put her hat on.
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